72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
package engine
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import (
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"encoding/gob"
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"image"
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"github.com/hajimehoshi/ebiten/v2"
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)
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func init() {
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gob.Register(AnimatedTile{})
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gob.Register(StaticTile(0))
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gob.Register(Tilemap{})
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}
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// Tilemap renders a grid of tiles.
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type Tilemap struct {
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Map [][]Tile
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Src ImageRef // must be a horizontal tile set
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TileSize int
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Transform ebiten.GeoM
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ZPos
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}
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// Draw draws the tilemap.
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func (t *Tilemap) Draw(screen *ebiten.Image, geom ebiten.GeoM) {
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geom.Concat(t.Transform)
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for j, row := range t.Map {
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for i, tile := range row {
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var op ebiten.DrawImageOptions
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op.GeoM.Translate(float64(i*t.TileSize), float64(j*t.TileSize))
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op.GeoM.Concat(geom)
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sx := tile.TileIndex() * t.TileSize
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src := t.Src.Image().SubImage(image.Rect(sx, 0, sx+t.TileSize, t.TileSize)).(*ebiten.Image)
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screen.DrawImage(src, &op)
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}
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}
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}
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// Update calls Update on any tiles that are Updaters, e.g. AnimatedTile.
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func (t *Tilemap) Update() error {
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for j := range t.Map {
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for i := range t.Map[j] {
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if tile, ok := t.Map[j][i].(Updater); ok {
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if err := tile.Update(); err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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// Tile is the interface needed by Tilemap.
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type Tile interface {
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TileIndex() int
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}
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// StaticTile returns a fixed tile index.
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type StaticTile int
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func (s StaticTile) TileIndex() int { return int(s) }
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// AnimatedTile uses an Anim to choose a tile index.
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type AnimatedTile struct {
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AnimRef
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}
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func (a *AnimatedTile) TileIndex() int { return a.Anim().CurrentFrame() }
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func (a *AnimatedTile) Update() error { return a.Anim().Update() }
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